RADIOLOGY EXIT EXAM REVIEW– QUESTIONS AND ANSWERS
| VERIFIED AND WELL DETAILED ANSWERS PLUS RATIONALES
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1. A patient arrives in the radiology department for a computed tomography (CT) scan of
the abdomen with intravenous contrast. During the injection, the patient complains of a
sudden warm flush and a mild metallic taste in their mouth. What is the most appropriate
initial course of action for the radiologic technologist?
A. Immediately halt the injection and call a code blue.
B. Reassure the patient that this is a normal, expected physiological response to iodinated
contrast media.
C. Administer an intramuscular dose of diphenhydramine immediately.
D. Lower the patient's feet to reverse potential hypotension.
Rationale: A transient warm flush and a metallic taste are very common, benign side effects of
intravascular iodinated contrast media and do not indicate an allergic or anaphylactic
reaction. Halting the injection or giving medication is unnecessary, while reassuring the
patient manages anxiety appropriately.
2. When positioning a patient for a standard lateral projection of the cervical spine, which
of the following central ray alignment parameters is critical to ensure proper anatomical
visualization?
A. Directed perpendicular to the center of the image receptor at the level of C1.
B. Directed horizontally and perpendicular to C4, maintaining a 72-inch source-to-image
distance to minimize magnification.
C. Angled 15 degrees cephalad to open up the intervertebral foramina.
D. Directed 5 degrees caudad centered on the external acoustic meatus.
Rationale: A 72-inch source-to-image distance is standard for lateral cervical spine
radiographs to offset the increased object-to-image distance caused by shoulder shoulders,
minimizing anatomical magnification and distortion.
3. A radiologic technologist notices that a cumulative air kerma display on a fluoroscopy
unit exceeds the threshold for potential tissue effects during a lengthy interventional
procedure. What is the primary responsibility of the technologist at this juncture?
,A. Immediately terminate the fluoroscopic exposure regardless of the physician's directive.
B. Document the radiation parameters, notify the supervising physician or radiologist, and
continue monitoring exposure metrics.
C. Reset the cumulative timer and clear the air kerma data from the log.
D. Direct the patient to submit an immediate incident report to the hospital safety committee.
Correct Answer: B. Document the radiation parameters, notify the supervising physician or
Rationale: Technologists must track and document high radiation doses during interventional
procedures and communicate them to the medical team, supporting radiation safety
management without prematurely interrupting clinically vital procedures.
4. Which of the following technical factor adjustments will double the radiation exposure to
the image receptor while maintaining constant patient positioning?
A. Doubling the milliamperage (mA) while keeping exposure time constant.
B. Halving the kilovoltage peak (kVp) while keeping mAs constant.
C. Increasing the source-to-image distance from 40 inches to 72 inches.
D. Reducing the grid ratio from 12:1 to 5:1.
Correct Answer: A. Doubling the milliamperage (mA) while keeping exposure time constant.
Rationale: X-ray emission is directly proportional to tube current (mA) and exposure time
(seconds). Doubling the mA directly doubles the number of X-ray photons produced, thereby
doubling the exposure to the image receptor.
5. During a magnetic resonance imaging (MRI) screening process, a patient indicates they
have a permanent cardiac pacemaker implanted in 2010. What is the standard safety
protocol regarding this patient?
A. The patient may enter Zone IV if the scanner's magnetic field is powered down to 1.5 Tesla.
B. The patient is absolutely contraindicated from entering the MR environment unless
explicitly cleared by the MR safety officer under strict conditional labeling guidelines.
C. The patient can safely undergo a scan if they remove all exterior metal jewelry and clothing
containing metal threads.
D. The scanner can be run at lower specific absorption rates to bypass pacemaker safety
restrictions.
, Rationale: Implanted cardiac devices are generally strong contraindications for MRI due to
risks of electromagnetic interaction, lead heating, and device malfunction, requiring rigorous
verification of MR conditional status by authorized personnel.
6. Which anatomical structure is best demonstrated on an anteroposterior (AP) axial
projection of the clavicle with the central ray directed 15 to 30 degrees cephalad?
A. The entire clavicle projected above the ribs and scapula for enhanced visualization.
B. The acromioclavicular joint space projected free of bony superposition.
C. The glenohumeral joint space in profile.
D. The coracoid process projected superior to the clavicular shaft.
Rationale: An axial (angled) projection utilizes cephalad angulation to project the clavicle
higher against the upper chest wall, clearing the ribs and lung apices for accurate fracture or
pathology assessment.
7. Under the principle of ALARA, which of the following combinations provides the
greatest reduction in patient radiation dose during diagnostic fluoroscopy?
A. Increasing magnification mode, increasing pulse rate, and moving the image intensifier far
from the patient.
B. Utilizing pulsed fluoroscopy, minimizing last-image-hold features, and keeping the tube close
to the patient.
C. Utilizing pulsed fluoroscopy, keeping the image receptor close to the patient, and
utilizing collimation.
D. Maximizing source-to-skin distance by moving the X-ray tube closer to the patient's skin
surface.
Rationale: Pulsed fluoroscopy reduces photon count, close proximity of the image receptor
reduces patient entrance dose, and tight collimation minimizes the irradiated tissue volume,
perfectly aligning with core ALARA strategies.
8. A patient scheduled for an intravenous pyelogram (IVP) exhibits an estimated
glomerular filtration rate (eGFR) of 25 mL/min/1.73m2. What is the most appropriate
clinical action to take prior to contrast administration?
A. Proceed with the routine high-dose contrast injection since eGFR is above 15.
B. Consult the referring physician and radiologist immediately, as this value indicates
severe renal impairment and high risk for contrast-induced nephropathy.
| VERIFIED AND WELL DETAILED ANSWERS PLUS RATIONALES
| GUARANTEED PASS | LATEST EXAM UPDATE | EXAM PREP |
STUDY GUIDE | PRACTICE TEST| DOWNLOAD INSTANT PDF
1. A patient arrives in the radiology department for a computed tomography (CT) scan of
the abdomen with intravenous contrast. During the injection, the patient complains of a
sudden warm flush and a mild metallic taste in their mouth. What is the most appropriate
initial course of action for the radiologic technologist?
A. Immediately halt the injection and call a code blue.
B. Reassure the patient that this is a normal, expected physiological response to iodinated
contrast media.
C. Administer an intramuscular dose of diphenhydramine immediately.
D. Lower the patient's feet to reverse potential hypotension.
Rationale: A transient warm flush and a metallic taste are very common, benign side effects of
intravascular iodinated contrast media and do not indicate an allergic or anaphylactic
reaction. Halting the injection or giving medication is unnecessary, while reassuring the
patient manages anxiety appropriately.
2. When positioning a patient for a standard lateral projection of the cervical spine, which
of the following central ray alignment parameters is critical to ensure proper anatomical
visualization?
A. Directed perpendicular to the center of the image receptor at the level of C1.
B. Directed horizontally and perpendicular to C4, maintaining a 72-inch source-to-image
distance to minimize magnification.
C. Angled 15 degrees cephalad to open up the intervertebral foramina.
D. Directed 5 degrees caudad centered on the external acoustic meatus.
Rationale: A 72-inch source-to-image distance is standard for lateral cervical spine
radiographs to offset the increased object-to-image distance caused by shoulder shoulders,
minimizing anatomical magnification and distortion.
3. A radiologic technologist notices that a cumulative air kerma display on a fluoroscopy
unit exceeds the threshold for potential tissue effects during a lengthy interventional
procedure. What is the primary responsibility of the technologist at this juncture?
,A. Immediately terminate the fluoroscopic exposure regardless of the physician's directive.
B. Document the radiation parameters, notify the supervising physician or radiologist, and
continue monitoring exposure metrics.
C. Reset the cumulative timer and clear the air kerma data from the log.
D. Direct the patient to submit an immediate incident report to the hospital safety committee.
Correct Answer: B. Document the radiation parameters, notify the supervising physician or
Rationale: Technologists must track and document high radiation doses during interventional
procedures and communicate them to the medical team, supporting radiation safety
management without prematurely interrupting clinically vital procedures.
4. Which of the following technical factor adjustments will double the radiation exposure to
the image receptor while maintaining constant patient positioning?
A. Doubling the milliamperage (mA) while keeping exposure time constant.
B. Halving the kilovoltage peak (kVp) while keeping mAs constant.
C. Increasing the source-to-image distance from 40 inches to 72 inches.
D. Reducing the grid ratio from 12:1 to 5:1.
Correct Answer: A. Doubling the milliamperage (mA) while keeping exposure time constant.
Rationale: X-ray emission is directly proportional to tube current (mA) and exposure time
(seconds). Doubling the mA directly doubles the number of X-ray photons produced, thereby
doubling the exposure to the image receptor.
5. During a magnetic resonance imaging (MRI) screening process, a patient indicates they
have a permanent cardiac pacemaker implanted in 2010. What is the standard safety
protocol regarding this patient?
A. The patient may enter Zone IV if the scanner's magnetic field is powered down to 1.5 Tesla.
B. The patient is absolutely contraindicated from entering the MR environment unless
explicitly cleared by the MR safety officer under strict conditional labeling guidelines.
C. The patient can safely undergo a scan if they remove all exterior metal jewelry and clothing
containing metal threads.
D. The scanner can be run at lower specific absorption rates to bypass pacemaker safety
restrictions.
, Rationale: Implanted cardiac devices are generally strong contraindications for MRI due to
risks of electromagnetic interaction, lead heating, and device malfunction, requiring rigorous
verification of MR conditional status by authorized personnel.
6. Which anatomical structure is best demonstrated on an anteroposterior (AP) axial
projection of the clavicle with the central ray directed 15 to 30 degrees cephalad?
A. The entire clavicle projected above the ribs and scapula for enhanced visualization.
B. The acromioclavicular joint space projected free of bony superposition.
C. The glenohumeral joint space in profile.
D. The coracoid process projected superior to the clavicular shaft.
Rationale: An axial (angled) projection utilizes cephalad angulation to project the clavicle
higher against the upper chest wall, clearing the ribs and lung apices for accurate fracture or
pathology assessment.
7. Under the principle of ALARA, which of the following combinations provides the
greatest reduction in patient radiation dose during diagnostic fluoroscopy?
A. Increasing magnification mode, increasing pulse rate, and moving the image intensifier far
from the patient.
B. Utilizing pulsed fluoroscopy, minimizing last-image-hold features, and keeping the tube close
to the patient.
C. Utilizing pulsed fluoroscopy, keeping the image receptor close to the patient, and
utilizing collimation.
D. Maximizing source-to-skin distance by moving the X-ray tube closer to the patient's skin
surface.
Rationale: Pulsed fluoroscopy reduces photon count, close proximity of the image receptor
reduces patient entrance dose, and tight collimation minimizes the irradiated tissue volume,
perfectly aligning with core ALARA strategies.
8. A patient scheduled for an intravenous pyelogram (IVP) exhibits an estimated
glomerular filtration rate (eGFR) of 25 mL/min/1.73m2. What is the most appropriate
clinical action to take prior to contrast administration?
A. Proceed with the routine high-dose contrast injection since eGFR is above 15.
B. Consult the referring physician and radiologist immediately, as this value indicates
severe renal impairment and high risk for contrast-induced nephropathy.
